# Invalid Interpolation Key

**URL:** <https://meta.discourse.org/t/invalid-interpolation-key/87944>\
**Category:** Product Support\
**Created:** [May 20, 2018, 7:10pm UTC](https://meta.discourse.org/t/invalid-interpolation-key/87944 "2018-05-20T19:10:39Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![BlackKnob](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/blackknob/32/93549_2.png) [@BlackKnob](https://meta.discourse.org/u/BlackKnob)\
**Post date:** [May 20, 2018, 8:32pm UTC](https://meta.discourse.org/t/invalid-interpolation-key/87944/3 "2018-05-20T20:32:33Z")

</div>

not sure what you mean by “arbitrary”.

`%{new_user_tips}` links to `system_messages.usage_tips.text_body_template` and can be used in:  
`system_messages.welcome_user.text_body_template`  
`system_messages.welcome_invite.text_body_template`

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